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mdevilliers / redishappy

Redis Sentinel high availabillity daemon
Apache License 2.0
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HAProxy tcp-check or redis-check #57

Closed samof76 closed 8 years ago

samof76 commented 8 years ago

How is redishappy with HAProxy better than what HAProxy does with tcp-check or [redis-check](http://cbonte.github.io/haproxy-dconv/1.7/configuration.html#option redis-check)?

mdevilliers commented 8 years ago

Hey,

redis-check - just checks that the 'thing-you-think-is-redis' speaks the redis protocol tcp-check - (using the example you linked to) can check that the redis instance is the master before writing to it. redishappy - will rewrite the haproxy config to point at the redis instance the is the master.

At the time of writing when redis instances come on-line they announce themselves as the master.

So in the case of tcp-check HAProxy will start sending writes to them. These writes will be discarded when the redis instance is made a slave of the master.

Hope all that makes sense,

Mark

samof76 commented 8 years ago

Hey thanks for that! Closing this issue, as it was just a query.